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S.. LAWSON. GAS ENGINE No. 498,476. Patented May 3o, 189s.`

i I r I I l F l n l I l I l l l Il l l l l l l 1 l X l l l l l l l I l l l I l l l l l l l l v2 Sheets-Sheet 2. ls. LAWSON. GAS ENGINE {No.Model.)

Y No. 498,476. Patented May so, 1893.

UNITED STATES PATENT OEEICE.

SAMUEL LAWSON, OF. NEW YORK, N. Y., ASSIGNOR TO HIMSELF ALONZO Y T. WELCH, OF SAME PLACE.

GAS-ENGINE.

SPECIFICATION forming partof Letters Patent No. 498,476, dated May 30, 1893.

Application med october 2,1891. serai 110.407.499. (No man.)

To all whom t may concern: proper time so that the air and gas pass to- 5o Be it known thatI, SAMUEL LAWSON, a citigether intol the cylinder A through the valve zen of the United States, residing in the city case L and port s as the piston C is descendand State of New York, have invented an Imingand the ignition takes place immediately 5 provement in Gas-Engines, of which the folafter the piston C reaches its extreme uplowing isa specification. ward movement, so as to give an.` impetus to 5 5' In nay-patent, No. 462,492, granted Novemthe-main shaft and fly wheel, and the escape ber 3, 1891, I have represented a verticalzi'g.` valve HY is open during the second up stroke niting tube with a horizontal bend at the of the piston, and the-parts are so timed that 1o lower end openinginto'the valve case, andin the valve b in the case L descends yto open the Valve there is anotch or port through the port s as the piston C commences t0 de- 6o which the gases pass to the ignitor and the scend, and the valve 17 opens` to admit the Haine passes back through kthese-parts to the gas; and the valve b rises sufficiently to close cylinder. the port s when the piston C- commences its I5 VIn my present invention the igniting tube up stroke, the kgas valve 17 simultaneously l vis attached to a moving valve, and in one po closing. 1 6: sition the Valve opens into the port leading Inview oftheforegoinggeneralexplanation, to the cylinder of the engine, for receiving it will now only be necessary to describe the the gases that are to be ignited; and in the igniting apparatus to'which my present-invenzo other position of this valve an opening is protion especially relates. vided to the external atmosphere, so that the The igniting tube Ois kept at a sufficiently `7ol conned gases within the igniting tube ywill high temperature tov ignite the-gas wit-hin it, escape to free such tube and prepare it for land for'this purpose a gas cock 23, jet 20and` the reception of the gas to be ignited when Bunsen burner P are provided, `there being z 5 the valve and igniting tube are moved to the openings at 22 for the admission of air to proport leading to the engine, and I give motion mote the combustion of the gas, anda caseP 75 to the igniting tube and its valve by a con-v around the tube O for coniining the heat of nection to the main valve of the engine. the ame to such tube. This tube O has` a In the drawings Figure l is an elevation of bend near its lower end and it is attached to 3o the cylinder, valve case and ignitor, the heatthe valve E, which is supported in VVproper ing tube or burner being removed. Fig. 2 is slides at one side of the valve case oi' at the 8o a section'at the line of Fig. et. Fig. 3 is connection between the valve case and the a sectional plan at the line y,y, Fig. 6. Fig. cylinder (through which the port s passes). 4 is a sectional plan at the line z, z, Fig. 2. This `valve E may be guided by a dovetail bar 35 Fig. 5 is asectional plan at theline z', e', Fig. 4 and groove, and the face of the valve rests 1, and Fig. 6 is a vertical section at the line against the portion L of the valve case, and 85 w of Fig. 3. l there is an opening or port inthe valve and The cylinder A, piston C, piston rod D, port a port 6 in the portion' L of Athe valve case, s, valve case L and valve b are similar to which port 6 opens into the port s to the cyl- 4o those in my aforesaid application, with the inder A. p

exception that the valve bis a plain cylinder 'When the valve E and igniting tube O are 9o without any notch or port. This valve b reraised to the port 6, the gas, which at this ceives its motion from a connecting rod I to time is confined and under pressure in the a gear that is revolved once for each two revocylinder A, passes through the ports 6 and 5 45 lutions of the crank shaft, as usual in engines into the igniting tube O and it is instantly igof this character, and the atmosphere is adnited, and the liame passes backinto the cyl- 9 5 mitted at the pipe 15, and gas is admitted inder A to explode the gas therein, and in from the pipe 16 by the valve 17 into the pasconsequence of the fresh explosive 'gases passsage 18, such valve 17 being opened at the ing through the port 6, there are no gaseous products of combustion near the ignitor tube to render the ignition unreliable.

When the valve E is drawn down so that the port 5 comes below the port 6, such port 5 comes into line with a small hole or port 7 which opens to the external atmosphere. This port is represented in Fig. 3, and the gases under pressure in the igniting tube -O expand and escape into the atmosphere, so as to empty this tube as much as possible and prepare it for receiving the next inow of gas when it is raised to the position indicated in `Figs. 2 and 4.

of for raising and lowering this valveE at the proper time. I have represented an arm 8 as extending out from the valve b and passing through a slot in the valve case L, and this arm 8 has an eye at its outer end and moves freely'over a screw rod 9 that is connected at its upper end with the valve E, and it is proi vided with lock nuts at 10 and 1l, and these are adjusted in such a manner thatafter the valve b has been raised sufciently to close the port s the arm 8 comes into contact with the lock nuts 10 and raises the valve E, and

the port 5 opens into the port 6 the moment the piston C has passed its uppermost movecape freely from the igniting tube, and upon the upward movement of the valve b it closes the port s at the proper time and then keeps on moving and the arm 8 acts upon the lock nuts l0 and the motions before described are repeated.

By this improvement the proper time is given for the ignition of the gases in the cylind'er and also for the escape of the spent gas in the igniting tube, and the exact period when the ignition takes place can be adjusted with great ease and accuracy.

Vhen the parts are timed so that the igniting tube remains open to the 'cylinder unt-il Y the piston reaches the end of the stroke after the explosion, a minus pressure will exist in Any suitable mechanism may be made use the igniting tube and the vent hole may not be required. l v 1 claim as my invention- 1. The combination with the piston and cylinder in a gas engine of a main `valve and means for moving the same, an igniting tube and its heater and a valve carrying the igniting tube, and a connection between the main valve and the igniting-tube-valve, whereby the latter receives its motion from the former near the terminations of the movements in opposite directions substantially as specified.

2. The combination in a gas engine, with the cylinder and gas valve, of an igniting tube, av valve'with whichv such igniting tube is connected, a burner for heating the igniting tube, an arm connected with ther main valve, a screw rod connected with the valve of the igniting tube and adjusting nuts for j regulating the action of the arm upon the valve, substantially asset forth.

3. The combination with the piston, cylinder and main valve, in a gas engine, of an igniting tube, a valve with which the lowerr end of the igniting tube is permanently connected and through'which vthe tube opens, a port leading to the engine cylinder, through which the air and gas pass to the igniting tube and are exploded, and a port opening to the atmosphere, and with which` the igniting-tube-valve coincides when not ycoinciding with the port leading to the engine cylinder and a connection between the main Valve and the ignitor valve to move the lattersubstantially as specited.l y

4. The combination with the cylinder and piston in a gasvr engine, of a main valve, a

valve case in which such valve slides, means for supplying air and .gas to the valve case, a port leading to the cylinder, an igniting tube and a valve carrying the same and sliding on the main valve case, there being aport in the valve and a lateral port opening into the main engine port, and means for giving to thefigniting tube andits` valve a movement in harmony with the main valve, substantially as specified.

Signed by me this 29th day of September, 1891.

s. LAwsoN.

V-itnesses:

GEO. T. PINCKNEY, WILLIAM G. MoTT.

IOC) 

